<!DOCTYPE html>
<html>

	<head>
		<meta charset="utf-8" />
		<title>学习js例子网址</title>
	</head>

	<body>
		<script>
			alert("欢迎来到本网站");
			document.write("<br/>" + "本站正在维护中...")
			console.log(3 + 4)
		</script>
	</body>

</html>

